Valve.



G. W. SHIELDS & B. WEBSTER.

VALVE.

APPLIUATION FILED FBB.20,1908.

Patented Feb. 2, 1909.

WITNESSE INVENTORS BY 13 l w a n ATTORNEY.

GEORGE W. SHIELDS AND BRADFORD WEBSTER, OF LOUISVILLE, KENTUCKY.

VALVE.

Specification of Letters Patent.

Patented Feb. 2, 1909.

Application filed February 20, 1908. Serial No. 416,931.

To all whom it vmay concern:

Be it known that we,-Groncn W. SHIELDS and BRADFORD Wensrea, citizens ofthe United States, residing at Louisville, in the county of Jeffersonand State of Kentucky have invented a new and useful Valve, 0 which thefollowing is a specification.

Our invention relates to valves or stopcocks for controlling the flow ofsteam, compressed air, water, or any other gas or fluid which isconducted in pipes or passages; and the objects of our improvement are,first, to provide a plug, so formed that the wear of friction will notlessen the tightness and snugness of its tit and at the same time thatit may turn freely and not become wed ed under pressure; second, toafford faci ities for steam, or other gas or fluid, to o crateautomatically, when the valve is c osed to keep the plug tight; and,third. to afford facilities for automatically blowing out the chamberwherein such steam pressure or other pressure is applied,so as to makeit unnecessary to remove the cap of the valve to clean it. \Veattainthese objects by the mechanism illustrated in the accompanyingdrawing in which--- Figure 1 is a vertical section of the entire ig. 2'isa plan of the plug, showing valve; h the relatlve position of the smalexhaust passages and the mampassage in the valve.-

The valve consists of, three pieces; the main body, fitted to receive anexhaust pipe in A and an inlet. ipein F, a taper lug between the pointsand a cap to screw over the largerend of t valve which receives theplug.

The main body of the valve has a small commencing at D, in the inlet,where y the steam pressure in the inlet pipe is admitted to the circularchamber, between the ap 1e it ihto snug.

to the large end of the plug to press the body of the valve to make itfit This assage is always open, and

when the va ve is closedythe entire static taper sides.

pressure of the steam or other fluid is applied to the large end of theplug. The small end of the plug isfitted with a ball joint to relievethe wear upon the taper sides of the plug and to prevent the plu fromwedging under pressure, as it would do ifall the lpressure was appliedon his ball 'oint. is most important because itenables t e plug to beturhed whereby the valve is opened, this smal and B; a taper p pg, 0

e end of the plug and the cap, and

I openin 5, said casing having the readily without relieving the ressureu on the larger end of the plu T 1e plug, w en in position, extendsoutside of the main bod of the valve with a tongue at B, at whic pointthe valve is turned on and 0E.

To revcnt the necessity of unscrewing the cap to clean out the chamberwhere the steam pressure is applied. to the lar e end of the plug, apassage is made from t 1e face of the large end of, the plug diagonallythrough the plug, to a point on the taper side of the plug where thepassage may 0 en into the main exhaust passage of the va ve. \Vithreference to the main opening H (Fig. 2) through the central part of thelug exhaust passage is so placed at one or more of the points Ur, G G",or G" that its opening does not meet the opening in the main bo y of thevalve into the exhaust part thereof, which it is intended to meet, whenthevalve is completely closed and when the valve is wide open, but onlywhen the plug is beingturned from closed to open, during which processthe small passage of the lug meets. the opening in the main body 0 thevalve at E Just before the main body of the valve begins to open, wherebthe full pressure of the steam or other uid blows out the chamber at thelarge end of the plug just before the main passage of the valve becomesopen. This arrangement is necessary, because the chamber would not' beblown out clean if the assage was only open when the full flow o steamor other fluid was passing through the mainpassage of the open valve.This arrangement keeps the entire valve clean by the automatic action ofthe moving steam or fluid.

We claim:

In a valve or sto -cock, a. valve casing having inlet and out et exhaustopenings, a rotary plugtherein having a main passage adapted to connectthe inlet. and exhaust one en of the plug connecte with the inlet, saidplug having an auxiliary plassage adapted to connect said chamber \vitsai exhaust opening when the plug is turned.

GEORGE W. SHIELDS. BRADFORD WEBSTER.

Witnesses ARTHUR C. PorHAM, KATHERINE Axum.

a chamber at;

